Paul faces a tough question: if God's law is good, how can it lead to death? He rejects this idea with a strong 'God forbid!' This reveals a crucial distinction about how we experience God's Word.
Paul clarifies that the Law itself is not the source of death. It's good, holy, and just. The problem isn't with the Law, but with sin that is dwelling within us.
Think of it like this: a doctor prescribes a healthy diet and exercise plan (the good Law). If someone chooses to ignore it and eat junk food instead, they get sick. The doctor's plan isn't to blame for their illness; it's the person's sinful choice to disobey.
Paul is clearing the Law of any wrongdoing. It's a perfect standard, and its inability to save us doesn't make it bad. It highlights the real enemy: sin.